Entropy production in inflation from spectator loops

Friedrich, Pavel; Prokopec, Tomislav

doi:10.1103/physrevd.100.083505

Cited by 10 publications

(21 citation statements)

References 82 publications

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“…There are some similarities between our work and that of [33], where decoherence through neglecting observationally inaccessible correlators was considered, and that of [34], where decoherence via entropy field loops was studied (decoherence of fluctuations through entropy loops was considered earlier in [35]). There is also a connection with the work of [36] where super-Hubble entanglement through inflaton decay was considered.…”

Section: Introductionmentioning

confidence: 67%

Entanglement entropy of cosmological perturbations

2020

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We show that the entropy of cosmological perturbations originating as quantum vacuum fluctuations in the very early universe, including the contribution of the leading nonlinear interactions, can be viewed as momentum space entanglement entropy between sub-and super-Hubble modes. The interactions between these modes cause decoherence of the super-Hubble fluctuations which, in turn, leads to a nonvanishing entropy of the reduced density matrix corresponding to the super-Hubble inhomogeneities. In particular, applying this to inflationary cosmology reveals that the entanglement entropy produced by leading order nonlinearities dominates over that coming from the squeezing of the vacuum state unless inflation lasts for a very short period. Furthermore, demanding that this entanglement entropy be smaller than the thermal entropy at the beginning of the radiation phase of standard cosmology leads to an upper bound on the duration of inflation which is similar to what is obtained from the trans-Planckian censorship conjecture.

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Section: Introductionmentioning

confidence: 67%

Entanglement entropy of cosmological perturbations

2020

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“…The constant contribution also depends on the choice of the initial state and for that reason cannot be fixed. The decaying logarithm does cause the time derivative of the conformally rescaled field to grow relative to its classical value, and that might be significant [55].…”

Section: Discussionmentioning

confidence: 99%

One loop graviton corrections to dynamical photons in de Sitter

Glavan¹,

Miao²,

Prokopec³

et al. 2017

Class. Quantum Grav.

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We employ a recent, general gauge computation of the one loop graviton contribution to the vacuum polarization on de Sitter to solve for one loop corrections to the photon mode function. The vacuum polarization takes the form of a gauge independent, spin 2 contribution and a gauge dependent, spin 0 contribution. We show that the leading secular corrections derive entirely from the spin 2 contribution.

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“…To consistently include the quantum loop effects on top of such a tree level treatment, one would have to solve the corresponding out-of-equilibrium problem using a perturbative quantum field theoretic framework such as the Schwinger-Keldysh formalism [18][19][20]. While progress has been made in applying such a formalism in baryogenesis/leptogenesis scenarios [21][22][23][24] (for reviews see [4,25]) and in cosmic inflation [26][27][28][29][30], little or no progress has been made in studying cosmological phase transitions.…”

Section: γV < γ < Ltmentioning

confidence: 99%

Field-theoretic derivation of bubble-wall force

Mancha

Prokopec

Świeżewska

2021

J. High Energ. Phys.

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We derive a general quantum field theoretic formula for the force acting on expanding bubbles of a first order phase transition in the early Universe setting. In the thermodynamic limit the force is proportional to the entropy increase across the bubble of active species that exert a force on the bubble interface. When local thermal equilibrium is attained, we find a strong friction force which grows as the Lorentz factor squared, such that the bubbles quickly reach stationary state and cannot run away. We also study an opposite case when scatterings are negligible across the wall (ballistic limit), finding that the force saturates for moderate Lorentz factors thus allowing for a runaway behavior. We apply our formalism to a massive real scalar field, the standard model and its simple portal extension. For completeness, we also present a derivation of the renormalized, one-loop, thermal energy-momentum tensor for the standard model and demonstrate its gauge independence.

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Entropy production in inflation from spectator loops

Cited by 10 publications

References 82 publications

Entanglement entropy of cosmological perturbations

Entanglement entropy of cosmological perturbations

One loop graviton corrections to dynamical photons in de Sitter

Field-theoretic derivation of bubble-wall force

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